<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <style>
    body {
      background: radial-gradient(
          circle closest-side at 60% 43%,
          #b03 26%,
          rgba(187, 0, 51, 0) 27%
        ),
        radial-gradient(
          circle closest-side at 40% 43%,
          #b03 26%,
          rgba(187, 0, 51, 0) 27%
        ),
        radial-gradient(
          circle closest-side at 40% 22%,
          #d35 45%,
          rgba(221, 51, 85, 0) 46%
        ),
        radial-gradient(
          circle closest-side at 60% 22%,
          #d35 45%,
          rgba(221, 51, 85, 0) 46%
        ),
        radial-gradient(
          circle closest-side at 50% 35%,
          #d35 30%,
          rgba(221, 51, 85, 0) 31%
        ),
        radial-gradient(
            circle closest-side at 60% 43%,
            #b03 26%,
            rgba(187, 0, 51, 0) 27%
          )
          50px 50px,
        radial-gradient(
            circle closest-side at 40% 43%,
            #b03 26%,
            rgba(187, 0, 51, 0) 27%
          )
          50px 50px,
        radial-gradient(
            circle closest-side at 40% 22%,
            #d35 45%,
            rgba(221, 51, 85, 0) 46%
          )
          50px 50px,
        radial-gradient(
            circle closest-side at 60% 22%,
            #d35 45%,
            rgba(221, 51, 85, 0) 46%
          )
          50px 50px,
        radial-gradient(
            circle closest-side at 50% 35%,
            #d35 30%,
            rgba(221, 51, 85, 0) 31%
          )
          50px 50px;
      background-color: #b03;
      background-size: 100px 100px;
    }
  </style>
  <body></body>
</html>
